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QGIS - Create Geotiff from WMS data ?

Luicid

Luicid

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france
Hi there,

The other day I created some cool elevation map using SRTM with 30m resolution that I've downloaded in .tiff files.
But today I wanted to created with better resolution:
I have access to a WMS (Web map service) with 2m resolution

Since this WMS is online, I wanted to "extract" geotiff from this.

Someone has an idea ?
 
A WMS layer is a view-only layer.
To be able to download data you need at least a WMTS layer, or, even better, have a look if the provider offers also downloadable tiles...
 
Hi,

WMS is only a color rendering indeed, you can better try to find the data on a WCS so that you can get the actual elevation values. But with tools like the GDAL command line tool you can export a TIFF file from a WMS/WCS and then use them for resample.
 
arno said:
Hi,

WMS is only a color rendering indeed, you can better try to find the data on a WCS so that you can get the actual elevation values. But with tools like the GDAL command line tool you can export a TIFF file from a WMS/WCS and then use them for resample.
Click to expand...

HI Arno:

Would you please be so kind as to provide a link to info on: :teacher:

"...the GDAL command line tool you can export a TIFF file from a WMS/WCS and then use them for resample" ?


I would like to learn about a worst-case scenario option for GIS sources that are either restricted to online access via ESRI ArcGIS-only, or whose web portals have not yet been developed to allow direct download of detailed GIS data via HTTP protocols.

Not that I'd really want to undergo the torture of learning to use obscure GDAL command line syntax, or the P.I.T.A. of QGIS when I have Global Mapper, multiple web browsers, and a fast internet connection that could make GIS data access less painful.

But otherwise restricted and/or limited GIS data servers are still a problem for the FSDev community, so we need more options.


BTW: Didn't you once consider allowing ScenProc access to GIS online data ?

Is there any update you could share with us on that option, as well as whether it may be updated for use with MSFS ?


Thanks in advance for your help with expanding our options to access GIS data. :)

GaryGB
 
Last edited:
GaryGB said:
Would you please be so kind as to provide a link to info on: :teacher:

"...the GDAL command line tool you can export a TIFF file from a WMS/WCS and then use them for resample" ?
Click to expand...

The GDAL documentation has many samples on using WMS and WCS:

WMS -- Web Map Services — GDAL documentation

gdal.org gdal.org

WCS -- OGC Web Coverage Service — GDAL documentation

gdal.org gdal.org

GaryGB said:
BTW: Didn't you once consider allowing ScenProc access to GIS online data ?
Click to expand...

Yes, scenProc has that capability, but at the moment it is not generally available at the moment. The project I showed in this thread has been made with scenProc. All photoreal and elevation BGL files have been made by accessing geographical data from WMS and WCS sources and converting them directly to BGL files. I did host my own geo server for performance reasons, instead of getting it from online sources. But technically that is the same.

www.fsdeveloper.com

Project ???

Hi all, Over the last few years I have added many features to scenProc, like the improved feature detection logic. These features have not only been made because they are cool to create, but also because I needed them for a project I was working on. Now that this project is reaching completion...
www.fsdeveloper.com www.fsdeveloper.com
 
Many thanks, Arno, for sharing that info with us. :)


PS: Specifically regarding converting WMS "color" images to gridded elevation data that we can use with Resample for Terrain Mesh, where would we find a work-flow via GDAL ? :scratchch

Or did you instead allude to how one uses GDAL to covert WMS "color" satellite imagery to GeoTIFFs used with Resample for imagery BGLs ? :oops:

GaryGB
 
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Hi,

I would never use color images of the elevation in your scenery. When they are rendered as a WMS it has the normal color range of 0 to 255. This means that you loose a lot of information from the elevation. So you can never make an accurate scenery out of it. You need to access the underlaying data from which the color map was made when you want to use it in resample. WCS allows that and as Matthias mentions WMTS might be an option as well.

To make a TIFF all you have to do is use gdal_translate to download the WMS data and save it to a TIFF file. With the command line arguments you can specify which area and resolution you want to have. And that GeoTIFF can easily be used in resample to make the BGL.
 
Thanks again for this clarification; that info regarding NOT attempting to convert WMS "color" images for elevation ...is as I suspected. ;)

GaryGB
 
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